完成句子翻译（共5小题；每小题2分，满分10分）
小题1:她欠我50元钱。
She was _____ _____ to me for 50 Yuan.
小题2:他从劳动中收益匪浅。
He _______ a lot _______ working.
小题3:他不能为他愚蠢的错误作出解析。
He could not ______ ______ his foolish mistake.
小题4:我们计划于7:30在电影院前见面，但他没有出现。
We arranged to meet at the cinema at 7:30, but he failed to _____ _____.
小题5:他为什么失败的原因的是他太粗心。(表语从句)
The reason______ he failed is ______he was too careless.